Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 403)

Glossary

G–5

program file: The area within a processor file that contains the ladder logic

program.

program mode: When the controller is not executing the processor file and all

outputs are de-energized.

program scan: A part of the controller’

s operating cycle. During the scan the

ladder program is executed and the Output data file is updated based on the program

and the Input data file.

programming device: Executable programming package used to develop ladder

diagrams.

protocol: The packaging of information that is transmitted across a network.

read: To acquire data from a storage place. For example, the processor READs

information from the input data file to solve the ladder program.

relay:

An electrically operated device that mechanically switches electrical circuits.

relay logic: A representation of the program or other logic in a form normally used

for relays.

REM Run mode:

REMote run mode during which the processor scans or executes

the ladder program, monitors input devices, ener

gizes output devices, and acts on

enabled I/O forces.

restore: To download (transfer) a program from a personal computer to a

controller.

reserved bit: A status file location that the user should not read or write to.

retentive data: Information associated with data files (timers, counters, inputs, and

outputs) in a program that is preserved through power cycles. Program files 2–15

are not effected by retentive data.

RS-232: An EIA standard that specifies electrical, mechanical, and functional

characteristics for serial binary communication circuits. A single-ended serial

communication interface.

run mode: When the processor file in the controller is being executed, inputs are

read, the program is scanned, and outputs are energized and de-energized.

rung: Ladder logic is comprised of a set of rungs. A rung contains input and

output instructions. During Run mode, the inputs on a rung are evaluated to be true

or false. If a path of true logic exists, the outputs are made true. If all paths are

false, the outputs are made false.

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Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario Pagina 403